OS Dev Cross Compiler (i686-elf-gcc)

cross-gcc.sh

#!/bin/sh

# Options
PREFIX="$HOME/opt/cross"
TARGET="i686-elf"
DEST="/tmp/osdev"

# Add to the path, and add it to the bash profile
export PATH="$PREFIX/bin:$PATH"

# Prepare the environment
export CC=gcc-4.9
export CXX=g++-4.9
export CPP=cpp-4.9
export LD=gcc-4.9

# Brew
if brew list -1 | grep -q "^gcc49\$"; then
    echo ""
    echo "\033[1;32mgcc49 already installed\033[0m"
else
    echo ""
    echo "\033[1;31mgcc49 not present... installing\033[0m"
    brew tap homebrew/versions
    brew install --enable-cxx  gcc49
fi

echo ""
echo "\033[1;33mChecking for required libraries...\033[0m"
for PKG in mpfr gmp libmpc; do
    if brew list -1 | grep -q "^${PKG}\$"; then
        echo "\033[1;32m${PKG} already installed\033[0m"
    else
        echo "\033[1;31m${PKG} not present... installing\033[0m"
        brew install ${PKG}
    fi
done

# Download the sources
GCC_6_4_SOURCE="https://ftp.gnu.org/gnu/gcc/gcc-6.4.0/gcc-6.4.0.tar.gz"
BINUTILS_2_29_SOURCE="https://ftp.gnu.org/gnu/binutils/binutils-2.29.tar.gz"
GCC_ARCHIVE=${DEST}/gcc49.tar.gz
BIN_UTILS_ARCHIVE=${DEST}/binutils.tar.gz

# Ensure the destination folder exists
if [[ ${PURGE} == "yes" ]]; then
    rm -rf ${DEST}
fi

mkdir -p ${DEST}

if [[ ! -f ${BIN_UTILS_ARCHIVE} ]]; then
    echo ""
    echo "\033[1;36mDownloading ${BINUTILS_2_29_SOURCE}\033[0m"
    curl -# ${BINUTILS_2_29_SOURCE} > ${BIN_UTILS_ARCHIVE}
fi

if [[ ! -f ${GCC_ARCHIVE} ]]; then
    echo ""
    echo "\033[1;36mDownloading ${GCC_6_4_SOURCE}\033[0m"
    curl -# ${GCC_6_4_SOURCE} > ${GCC_ARCHIVE}
fi

# Unpack the packages and prepare for building the toolchain
BUILD_SRC=${DEST}
BIN_UTILS_DIR=${BUILD_SRC}/binutils-2.29-build
GCC_DIR=${BUILD_SRC}/gcc-6.4-build

mkdir -p ${BIN_UTILS_DIR} ${GCC_DIR}

echo ""
echo "\033[1;33mExpanding downloaded packages\033[0m"
cd ${DEST}
tar -zxf ${BIN_UTILS_ARCHIVE}
tar -zxf ${GCC_ARCHIVE}


echo ""
echo "\033[1;33mConfiguring & Installing binutils\033[0m"
cd ${BIN_UTILS_DIR}
../binutils-2.29/configure --target=${TARGET} --prefix="${PREFIX}"\
    --disable-nls --disable-werror
make
make install

cd ${GCC_DIR}
../gcc-6.4.0/configure --target=$TARGET --prefix="$PREFIX"\
    --disable-nls --enable-languages=c,c++ --without-headers
make all-gcc
make all-target-libgcc
make install-gcc
make install-target-libgcc

# add the tools to the users PATH and bash profile
echo ""
echo "\033[1;33mAdding tools to your profile & PATH\033[0m"
echo "export PATH=\"\$PATH:$PREFIX/bin\"" >> ~/.bash_profile


# Clean up... we've finished everything
cd ${DIR}
rm -rf ${DEST}


# Give a final wrap up message to the user with instructions.
cat <<EOF
\033[1;32mGCC Cross Compiler & Supporting Tools installed!\033[0m
The installation has now finished and the toolchain is now ready for use.
Unless you specified otherwise, the gcc compiler can be used by calling
\033[1;35mi686-elf-gcc\033[0m.
However there is one final step that you need to do before you can use it. That
is to run the following command:
    source ~/.bash_profile
After that you will be good to go!
EOF